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diff --git a/gdb/arch/arm-linux.h b/gdb/arch/arm-linux.h
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+/* Common target dependent code for GNU/Linux on ARM systems.
+
+   Copyright (C) 1999-2015 Free Software Foundation, Inc.
+
+   This file is part of GDB.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#ifndef ARM_LINUX_H
+#define ARM_LINUX_H
+
+/* There are a couple of different possible stack layouts that
+   we need to support.
+
+   Before version 2.6.18, the kernel used completely independent
+   layouts for non-RT and RT signals.  For non-RT signals the stack
+   began directly with a struct sigcontext.  For RT signals the stack
+   began with two redundant pointers (to the siginfo and ucontext),
+   and then the siginfo and ucontext.
+
+   As of version 2.6.18, the non-RT signal frame layout starts with
+   a ucontext and the RT signal frame starts with a siginfo and then
+   a ucontext.  Also, the ucontext now has a designated save area
+   for coprocessor registers.
+
+   For RT signals, it's easy to tell the difference: we look for
+   pinfo, the pointer to the siginfo.  If it has the expected
+   value, we have an old layout.  If it doesn't, we have the new
+   layout.
+
+   For non-RT signals, it's a bit harder.  We need something in one
+   layout or the other with a recognizable offset and value.  We can't
+   use the return trampoline, because ARM usually uses SA_RESTORER,
+   in which case the stack return trampoline is not filled in.
+   We can't use the saved stack pointer, because sigaltstack might
+   be in use.  So for now we guess the new layout...  */
+
+/* There are three words (trap_no, error_code, oldmask) in
+   struct sigcontext before r0.  */
+#define ARM_SIGCONTEXT_R0 0xc
+
+/* There are five words (uc_flags, uc_link, and three for uc_stack)
+   in the ucontext_t before the sigcontext.  */
+#define ARM_UCONTEXT_SIGCONTEXT 0x14
+
+/* There are three elements in an rt_sigframe before the ucontext:
+   pinfo, puc, and info.  The first two are pointers and the third
+   is a struct siginfo, with size 128 bytes.  We could follow puc
+   to the ucontext, but it's simpler to skip the whole thing.  */
+#define ARM_OLD_RT_SIGFRAME_SIGINFO 0x8
+#define ARM_OLD_RT_SIGFRAME_UCONTEXT 0x88
+
+#define ARM_NEW_RT_SIGFRAME_UCONTEXT 0x80
+
+#define ARM_NEW_SIGFRAME_MAGIC 0x5ac3c35a
+
+int
+arm_linux_sigreturn_next_pc_offset (unsigned long sp,
+				    unsigned long sp_data,
+				    unsigned long svc_number,
+				    int is_sigreturn);
+
+#endif /* ARM_LINUX_H */